Amplitude-phase OFDM modulation method for wireless optical communication system

The invention discloses an amplitude-phase OFDM modulation method for a wireless optical communication system, which is called as amplitude-phase optical OFDM. In this method, there is no need for Hermitian symmetric data at the input of the OFDM modulator to generate a real signal. Instead, the amplitude and phase components of the conventional complex numerical OFDM signal are continuously transmitted. The MPO-OFDM quantizes the transmitted phase information, and performs coding transmission by using M-order pulse amplitude modulation (M-PAM). By using the M-PAM the influence of additive noise on the phase component can be effectively reduced. On the basis, the modulation coefficient for controlling the amplitude of the transmitted signal is optimized, so that the signal-to-noise ratio (SNR) of the amplitude component is maximized. Compared with DCO, ACO, U-OFDM and OFDM based on polarity, the MPO-OFDM provided by the invention can provide better bit error rate (BER) performance. 本发明公开了一种用于无线光通信系统的幅相OFDM调制方